/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBox.h
typedef TBaseDelegate_TwoParams< void, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FMultiBox](API\Runtime\Slate\Framework\MultiBox\FMultiBox) > &, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SMultiBoxWidget](API\Runtime\Slate\Framework\MultiBox\SMultiBoxWidget) > & > FOnMakeMultiBoxBuilderOverride